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mfd: rtsx: Read vendor setting from config space
[mirror_ubuntu-bionic-kernel.git] / drivers / mfd / rts5227.c
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1/* Driver for Realtek PCI-Express card reader
2 *
3 * Copyright(c) 2009 Realtek Semiconductor Corp. All rights reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2, or (at your option) any
8 * later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, see <http://www.gnu.org/licenses/>.
17 *
18 * Author:
19 * Wei WANG <wei_wang@realsil.com.cn>
20 * No. 450, Shenhu Road, Suzhou Industry Park, Suzhou, China
21 *
22 * Roger Tseng <rogerable@realtek.com>
23 * No. 2, Innovation Road II, Hsinchu Science Park, Hsinchu 300, Taiwan
24 */
25
26#include <linux/module.h>
27#include <linux/delay.h>
28#include <linux/mfd/rtsx_pci.h>
29
30#include "rtsx_pcr.h"
31
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32static void rts5227_fill_driving(struct rtsx_pcr *pcr, u8 voltage)
33{
34 u8 driving_3v3[4][3] = {
35 {0x13, 0x13, 0x13},
36 {0x96, 0x96, 0x96},
37 {0x7F, 0x7F, 0x7F},
38 {0x96, 0x96, 0x96},
39 };
40 u8 driving_1v8[4][3] = {
41 {0x99, 0x99, 0x99},
42 {0xAA, 0xAA, 0xAA},
43 {0xFE, 0xFE, 0xFE},
44 {0xB3, 0xB3, 0xB3},
45 };
46 u8 (*driving)[3], drive_sel;
47
48 if (voltage == OUTPUT_3V3) {
49 driving = driving_3v3;
50 drive_sel = pcr->sd30_drive_sel_3v3;
51 } else {
52 driving = driving_1v8;
53 drive_sel = pcr->sd30_drive_sel_1v8;
54 }
55
56 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD30_CLK_DRIVE_SEL,
57 0xFF, driving[drive_sel][0]);
58 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD30_CMD_DRIVE_SEL,
59 0xFF, driving[drive_sel][1]);
60 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD30_DAT_DRIVE_SEL,
61 0xFF, driving[drive_sel][2]);
62}
63
64static void rts5227_fetch_vendor_settings(struct rtsx_pcr *pcr)
65{
66 u32 reg;
67
68 rtsx_pci_read_config_dword(pcr, PCR_SETTING_REG1, &reg);
69 dev_dbg(&(pcr->pci->dev), "Cfg 0x%x: 0x%x\n", PCR_SETTING_REG1, reg);
70
71 if (!rtsx_vendor_setting_valid(reg))
72 return;
73
74 pcr->aspm_en = rtsx_reg_to_aspm(reg);
75 pcr->sd30_drive_sel_1v8 = rtsx_reg_to_sd30_drive_sel_1v8(reg);
76 pcr->card_drive_sel &= 0x3F;
77 pcr->card_drive_sel |= rtsx_reg_to_card_drive_sel(reg);
78
79 rtsx_pci_read_config_dword(pcr, PCR_SETTING_REG2, &reg);
80 dev_dbg(&(pcr->pci->dev), "Cfg 0x%x: 0x%x\n", PCR_SETTING_REG2, reg);
81 pcr->sd30_drive_sel_3v3 = rtsx_reg_to_sd30_drive_sel_3v3(reg);
82 if (rtsx_reg_check_reverse_socket(reg))
83 pcr->flags |= PCR_REVERSE_SOCKET;
84}
85
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86static int rts5227_extra_init_hw(struct rtsx_pcr *pcr)
87{
88 u16 cap;
89
90 rtsx_pci_init_cmd(pcr);
91
92 /* Configure GPIO as output */
93 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, GPIO_CTL, 0x02, 0x02);
94 /* Switch LDO3318 source from DV33 to card_3v3 */
95 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, LDO_PWR_SEL, 0x03, 0x00);
96 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, LDO_PWR_SEL, 0x03, 0x01);
97 /* LED shine disabled, set initial shine cycle period */
98 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, OLT_LED_CTL, 0x0F, 0x02);
99 /* Configure LTR */
100 pcie_capability_read_word(pcr->pci, PCI_EXP_DEVCTL2, &cap);
101 if (cap & PCI_EXP_LTR_EN)
102 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, LTR_CTL, 0xFF, 0xA3);
103 /* Configure OBFF */
104 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, OBFF_CFG, 0x03, 0x03);
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105 /* Configure driving */
106 rts5227_fill_driving(pcr, OUTPUT_3V3);
107 /* Configure force_clock_req */
108 if (pcr->flags & PCR_REVERSE_SOCKET)
109 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD,
110 AUTOLOAD_CFG_BASE + 3, 0xB8, 0xB8);
111 else
112 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD,
113 AUTOLOAD_CFG_BASE + 3, 0xB8, 0x88);
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114
115 return rtsx_pci_send_cmd(pcr, 100);
116}
117
118static int rts5227_optimize_phy(struct rtsx_pcr *pcr)
119{
120 /* Optimize RX sensitivity */
121 return rtsx_pci_write_phy_register(pcr, 0x00, 0xBA42);
122}
123
124static int rts5227_turn_on_led(struct rtsx_pcr *pcr)
125{
126 return rtsx_pci_write_register(pcr, GPIO_CTL, 0x02, 0x02);
127}
128
129static int rts5227_turn_off_led(struct rtsx_pcr *pcr)
130{
131 return rtsx_pci_write_register(pcr, GPIO_CTL, 0x02, 0x00);
132}
133
134static int rts5227_enable_auto_blink(struct rtsx_pcr *pcr)
135{
136 return rtsx_pci_write_register(pcr, OLT_LED_CTL, 0x08, 0x08);
137}
138
139static int rts5227_disable_auto_blink(struct rtsx_pcr *pcr)
140{
141 return rtsx_pci_write_register(pcr, OLT_LED_CTL, 0x08, 0x00);
142}
143
144static int rts5227_card_power_on(struct rtsx_pcr *pcr, int card)
145{
146 int err;
147
148 rtsx_pci_init_cmd(pcr);
149 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
150 SD_POWER_MASK, SD_PARTIAL_POWER_ON);
151 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
152 LDO3318_PWR_MASK, 0x02);
153 err = rtsx_pci_send_cmd(pcr, 100);
154 if (err < 0)
155 return err;
156
157 /* To avoid too large in-rush current */
158 udelay(150);
159
160 rtsx_pci_init_cmd(pcr);
161 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
162 SD_POWER_MASK, SD_POWER_ON);
163 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
164 LDO3318_PWR_MASK, 0x06);
165 err = rtsx_pci_send_cmd(pcr, 100);
166 if (err < 0)
167 return err;
168
169 return 0;
170}
171
172static int rts5227_card_power_off(struct rtsx_pcr *pcr, int card)
173{
174 rtsx_pci_init_cmd(pcr);
175 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
176 SD_POWER_MASK | PMOS_STRG_MASK,
177 SD_POWER_OFF | PMOS_STRG_400mA);
178 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
179 LDO3318_PWR_MASK, 0X00);
180 return rtsx_pci_send_cmd(pcr, 100);
181}
182
183static int rts5227_switch_output_voltage(struct rtsx_pcr *pcr, u8 voltage)
184{
185 int err;
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186
187 if (voltage == OUTPUT_3V3) {
188 err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4FC0 | 0x24);
189 if (err < 0)
190 return err;
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191 } else if (voltage == OUTPUT_1V8) {
192 err = rtsx_pci_write_phy_register(pcr, 0x11, 0x3C02);
193 if (err < 0)
194 return err;
195 err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4C80 | 0x24);
196 if (err < 0)
197 return err;
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198 } else {
199 return -EINVAL;
200 }
201
202 /* set pad drive */
203 rtsx_pci_init_cmd(pcr);
773ccdfd 204 rts5227_fill_driving(pcr, voltage);
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205 return rtsx_pci_send_cmd(pcr, 100);
206}
207
208static const struct pcr_ops rts5227_pcr_ops = {
773ccdfd 209 .fetch_vendor_settings = rts5227_fetch_vendor_settings,
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210 .extra_init_hw = rts5227_extra_init_hw,
211 .optimize_phy = rts5227_optimize_phy,
212 .turn_on_led = rts5227_turn_on_led,
213 .turn_off_led = rts5227_turn_off_led,
214 .enable_auto_blink = rts5227_enable_auto_blink,
215 .disable_auto_blink = rts5227_disable_auto_blink,
216 .card_power_on = rts5227_card_power_on,
217 .card_power_off = rts5227_card_power_off,
218 .switch_output_voltage = rts5227_switch_output_voltage,
219 .cd_deglitch = NULL,
220 .conv_clk_and_div_n = NULL,
221};
222
223/* SD Pull Control Enable:
224 * SD_DAT[3:0] ==> pull up
225 * SD_CD ==> pull up
226 * SD_WP ==> pull up
227 * SD_CMD ==> pull up
228 * SD_CLK ==> pull down
229 */
230static const u32 rts5227_sd_pull_ctl_enable_tbl[] = {
231 RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
232 RTSX_REG_PAIR(CARD_PULL_CTL3, 0xE9),
233 0,
234};
235
236/* SD Pull Control Disable:
237 * SD_DAT[3:0] ==> pull down
238 * SD_CD ==> pull up
239 * SD_WP ==> pull down
240 * SD_CMD ==> pull down
241 * SD_CLK ==> pull down
242 */
243static const u32 rts5227_sd_pull_ctl_disable_tbl[] = {
244 RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
245 RTSX_REG_PAIR(CARD_PULL_CTL3, 0xD5),
246 0,
247};
248
249/* MS Pull Control Enable:
250 * MS CD ==> pull up
251 * others ==> pull down
252 */
253static const u32 rts5227_ms_pull_ctl_enable_tbl[] = {
254 RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
255 RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
256 0,
257};
258
259/* MS Pull Control Disable:
260 * MS CD ==> pull up
261 * others ==> pull down
262 */
263static const u32 rts5227_ms_pull_ctl_disable_tbl[] = {
264 RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
265 RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
266 0,
267};
268
269void rts5227_init_params(struct rtsx_pcr *pcr)
270{
271 pcr->extra_caps = EXTRA_CAPS_SD_SDR50 | EXTRA_CAPS_SD_SDR104;
272 pcr->num_slots = 2;
273 pcr->ops = &rts5227_pcr_ops;
274
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275 pcr->flags = 0;
276 pcr->card_drive_sel = RTSX_CARD_DRIVE_DEFAULT;
277 pcr->sd30_drive_sel_1v8 = CFG_DRIVER_TYPE_B;
278 pcr->sd30_drive_sel_3v3 = CFG_DRIVER_TYPE_B;
279 pcr->aspm_en = ASPM_L1_EN;
280
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281 pcr->sd_pull_ctl_enable_tbl = rts5227_sd_pull_ctl_enable_tbl;
282 pcr->sd_pull_ctl_disable_tbl = rts5227_sd_pull_ctl_disable_tbl;
283 pcr->ms_pull_ctl_enable_tbl = rts5227_ms_pull_ctl_enable_tbl;
284 pcr->ms_pull_ctl_disable_tbl = rts5227_ms_pull_ctl_disable_tbl;
285}